This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A303623 #4 Apr 27 2018 09:54:59 %S A303623 1,496,5411,160807,5249045,179884814,6323564388,224091914399, %T A303623 7966090548780,283582960504149,10101258867472961,359903623078870120, %U A303623 12824695714808614687,457013934122432156738,16286250681449999285061 %N A303623 Number of nX7 0..1 arrays with every element equal to 0, 2, 3, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A303623 Column 7 of A303624. %H A303623 R. H. Hardin, <a href="/A303623/b303623.txt">Table of n, a(n) for n = 1..210</a> %e A303623 Some solutions for n=5 %e A303623 ..0..0..0..0..0..1..1. .0..0..1..0..0..0..1. .0..0..0..0..0..0..0 %e A303623 ..0..0..0..0..1..1..1. .0..0..0..0..0..0..0. .0..0..0..1..0..0..0 %e A303623 ..0..0..0..0..0..1..1. .0..0..0..0..0..0..0. .0..0..0..0..0..0..0 %e A303623 ..0..0..0..1..1..1..0. .0..0..0..0..0..1..1. .0..0..0..0..0..0..0 %e A303623 ..0..0..1..1..1..1..0. .0..0..0..0..1..1..1. .0..0..0..0..0..0..0 %Y A303623 Cf. A303624. %K A303623 nonn %O A303623 1,2 %A A303623 _R. H. Hardin_, Apr 27 2018